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Go to "System Preferences", then select "Sartup Disk" in "System" section. You gonna see the list of all available partitions for booting. Select the partition you want.

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Q: How do you Erase mac startup disk?
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How do you boot into Mac OS X without changing the startup disk?

press on startup to display the bootable disks.


How do you format Micro SD card with a MAC?

go to disk utility and you have the option to erase there


Why Mac OS x doesn't star up?

The fix could be that you are using the wrong startup disk. When you turn your PC or mac on press f1 repeatedly until you come to the startup menu. From this select 'startup' preferences, start up disk and select the right one. If you are unsure there is no harm in trying them all as i doubt you will have more than 2 hard disks.


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